1.Selectable light source:L0 Standard light source:1000 L2 Red LED:0.516 L4 Green LED:1.216 L6 Purple LED:1.148 L7-L9 Self-defined light:1000 (default|),the coefficient value can be adjusted. Wide measurement range Max range: 300,000LUX; Resolution:0.1 LUX. | 2.Wide measurement range Max range: 300,000LUX; Resolution:0.1 LUX. | 3.Ambient temperature/humidity test supported.Temperature range: 0 ~ 60°C; Accuracy: ±2°C; Humidity range: 0 ~ 99%RH; Accuracy:±8%RH.(only TA631B) | 4.Upper/lower limit alarm:The upper and lower alarm limit is settable. The screen will emit red background light when over upper and lower limit. | 5.Data hold: Support to hold the max value, min value, average value and real-time value during the measurement.